Malicious PDF — malware analysis report

Static analysis result for SHA-256 af48b07bb5e9be84…

MALICIOUS

PDF

72.1 KB Created: 2021-02-28 11:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b00b7f27043931ede259ec97af32847d SHA-1: 122ecc3503cb85a61743ab6ed8ec2f65818b27eb SHA-256: af48b07bb5e9be84e5b0d67acc1f0ae6a133d9579b07af7c4a2625c548e5b8ce
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=betty+crocker+cookbook+1969+lasagna+recipe In PDF document text
    • http://baffer-shop.space/nakeworunixolotomozogerard7ws.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/tupivutitedededemo.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/tukuxib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5ff042e3382dd.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/7046033470.pdfIn PDF document text
    • http://allfreebets.ru/xajujadigazolawomadubawuxhfmu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fe99528a2020.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/gelugaxudizotuvuj.pdfIn PDF document text
    • http://hihikane.space/jowixigisanutogotapuwts4gg.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/mabafopevanix.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/how_to_use_google_maps_offline_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_60318674c21c2.pdfIn PDF document text
    • http://com-servers.online/71713177879q0ec7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozidijapepore.atwebpages.com/icharger_206b_firmware.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/panasonic_bread_maker_sd_200_spare_parts.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/leletepeko.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/15745094617.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 5816 bytes
SHA-256: 1d27f3cf2dfbbf5fe28aefd44cd21541ea37409a20c6f4a9324b56f190b7d6b1
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 11032 bytes
SHA-256: 98ee758df5ec871aad4e75c5433b32df6bfc05e0271e5b8529e4169eece1f7a8

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